Spray Foam and Mortgages: Why Lenders Say No

Spray foam insulation was sold as an energy-saving upgrade and was heavily grant-funded for a time. Yet many Warwickshire homeowners now find it works against them the moment they try to sell, remortgage or insure. This guide explains why, plainly.

What changed

From around 2023, most major UK lenders and the surveyors who act for them tightened their approach to spray foam — not a single ban, but a broad shift in caution built up over years of installations.

What worries a lender

Three linked concerns:

• Hidden timbers. Foam on the underside of the roof stops a surveyor inspecting the rafters and battens, so they cannot confirm the roof is sound.
• Trapped moisture. Closed-cell foam can seal moisture against the timber, risking rot — and because the timber is hidden, no one can rule it out.
• Future liability. Removing foam is skilled work, so the lender sees a property that may cost the next owner money, and prices that risk in.

What a surveyor looks for

A RICS surveyor wants to see the roof structure and confirm it is in good order. Spray foam prevents that, so they typically recommend removal or a specialist inspection and report before the valuation can be relied upon.

How the problem is resolved

1. Have the loft surveyed to confirm the foam type and roof condition.
2. Remove the foam cleanly if the report recommends it, exposing the timbers.
3. Treat any genuine timber issues found.
4. Obtain a written report confirming the work and the roof's condition.

With the timbers visible and documented, the lender's concerns fall away and the property is treated normally again.

A note on selling

If you are selling, it is usually worth resolving this before you go to market, or at least being upfront. Buyers' lenders will raise the same objection, so a home advertised with the foam already dealt with is a far easier sale.

If your sale or remortgage has stalled over spray foam in Leamington or Warwickshire, request a free survey and we will explain exactly where you stand.